scholarly journals Peri-intraventricular hemorrhage: Study of the inhibitory effect of auditory efferent pathway

CoDAS ◽  
2020 ◽  
Vol 32 (6) ◽  
Author(s):  
Elaine Colombo Sousa Maruta ◽  
Marisa Frasson de Azevedo
Keyword(s):  
Auditory System ◽  
Gestational Age ◽  
Otoacoustic Emissions ◽  
Intraventricular Hemorrhage ◽  
Evoked Potential ◽  
Inhibitory Effect ◽  
Auditory Evoked Potential ◽  
Study Group ◽  
Premature Newborns ◽  
Auditory Efferent

Abstract: Purpose: to determine the functioning of the efferent auditory system in premature newborns with intraventricular hemorrhage. Method: the sample consisted of 44 newborns, divided into two groups. The study group was composed of 22 premature newborns with intraventricular hemorrhage/and the control group was composed of 22 newborns without intraventricular hemorrhage, matched to the study group for gestational age, correct gestational age and sex. The groups were submitted to the evaluation of the inhibitory effect of auditory efferent in otoacoustic emissions (equipment ILOv6-Otodynamics Ltda®) and auditory evoked potential with and without contralateral noise (equipment SmartEP-Intelligent Hearing Systems®). Results: newborns with intraventricular hemorrhage exhibited a higher occurrence of central hearing alteration as well as a lesser occurrence of the inhibitory effect of auditory efferent in otoacoustic emissions and auditory evoked potential compared to the newborns without this condition. An association was found between central hearing alteration and a lower occurrence of inhibitory effect. Agreement was found between the inhibitory effect test on otoacoustic emissions and latency of the auditory evoked potential. Conclusion: premature newborns with intraventricular hemorrhage have a greater occurrence of functional abnormality of the afferent auditory system, which can be effectively identified through an evaluation of the inhibitory effect of auditory efferent in otoacoustic emissions evoked by a transient stimulus and latency parameter in the brainstem auditory evoked potential.

scholarly journals Electrophysiological study of hearing in full-term small-for-gestational-age newborns

2012 ◽  
Vol 24 (2) ◽  
pp. 162-167 ◽  
Author(s):  
Rosanna Mariangela Giaffredo Angrisani ◽  
Marisa Frasson De Azevedo ◽  
Renata Mota Mamede Carvallo ◽  
Edna Maria de Albuquerque Diniz ◽  
Carla Gentile Matas
Keyword(s):  
Gestational Age ◽  
Small For Gestational Age ◽  
Otoacoustic Emissions ◽  
Full Term ◽  
Auditory Evoked Potential ◽  
Control Group ◽  
Study Group ◽  
Risk Indicator ◽  
Hearing Impairments ◽  
Appropriate For Gestational Age

PURPOSE: To describe the Brainstem Auditory Evoked Potential (BAEP) results of full-term small-for-gestational-age newborns, comparing them to the results of full-term appropriate-for-gestational-age newborns, in order to verify whether the small-for-gestational-age condition is a risk indicator for retrocochlear hearing impairment. METHODS: This multicentric prospective cross-sectional study assessed 86 full-term newborns - 47 small- (Study Group) and 39 appropriate-for-gestational-age (Control Group - of both genders, with ages between 2 and 12 days. Newborns with presence of transient evoked otoacoustic emissions and type A tympanometry were included in the study. Quantitative analysis was based on the mean and standard deviation of the absolute latencies of waves I, III and V and interpeak intervals I-III, III-V and I-V, for each group. For qualitative analysis, the BAEP results were classified as normal or altered by analyzing these data considering the age range of the newborn at the time of testing. RESULTS: In the Study Group, nine of the 18 (38%) subjects with altered BAEP results had the condition of small-for-gestational-age as the only risk factor for hearing impairments. In the Control Group, seven (18%) had altered results. Female subjects from the Study Group tended to present more central alterations. In the Control Group, the male group tended to have more alterations. CONCLUSION: Full-term children born small or appropriate for gestational age might present transitory or permanent central hearing impairments, regardless of the presence of risk indicators.

scholarly journals Neural responses to perturbations in visual and auditory metronomes during sensorimotor synchronization

2018 ◽  
Author(s):  
Ramesh Balasubramaniam ◽  
Daniel Comstock
Keyword(s):  
Visual System ◽  
Error Correction ◽  
Auditory System ◽  
Evoked Potential ◽  
Auditory Evoked Potential ◽  
Sensorimotor Synchronization ◽  
Meaningful Improvement ◽  
Eeg Data ◽  
Phase Corrections ◽  
Visual Evoked

Tapping in synchrony to an isochronous rhythm involves several key functions of the sensorimotor system including timing, prediction and error correction. While auditory sensorimotor synchronization (SMS) has been well studied, much less is known about mechanisms involved in visual SMS. By comparing error correction in auditory and visual SMS, it can be determined if the neural mechanisms for detection and correction of synchronization errors are generalized or domain specific. To study this problem, we measured EEG while subjects tapped in synchrony to separate visual and auditory metronomes that both contained small temporal perturbations to induce errors. The metronomes had inter-onset intervals of 600 milliseconds and the perturbations where of 4 kinds: +/- 66 milliseconds to induce period corrections, and +/- 16 milliseconds to induce phase corrections. We hypothesize that given the less precise nature of visual SMS, error correction to perturbed visual flashing rhythms will be more gradual than with the equivalent auditory perturbations. Additionally, we expect this more gradual error correction will be reflected in the visual evoked potentials. Our findings indicate that the visual system is only capable of more gradual phase corrections to even the larger induced errors. This is opposed to the swifter period correction of the auditory system to large induced errors. EEG data found the peak N1 auditory evoked potential is modulated by the size and direction of an induced error in line with previous research, while the P1 visual evoked potential was only effected by the large late-coming perturbations resulting in reduced peak latency. Looking at the error response EEG data, an Error Related Negativity (ERN) and related Error Positivity (pE) was found only in the auditory +66 condition, while no ERN or pE were found in any of the visual perturbation conditions. In addition to the ERPs, we performed a dipole source localization and clustering analysis indicating that the anterior cingulate was active in the error detection of the perturbed stimulus for both auditory and visual conditions in addition to being involved in producing the ERN and pE induced by the auditory +66 perturbation. Taken together, these results confirm that the visual system is less developed for synchronizing and error correction with flashing rhythms by its more gradual error correction. The reduced latency of the P1 to the visual +66 suggests that the visual system can detect these errors, but that detection does not translate into any meaningful improvement in error correction. This indicates that the visual system is not as tightly coupled to the motor system as the auditory system is for SMS, suggesting the mechanisms of SMS are not completely domain general.

scholarly journals ANALYSIS OF OTOACOUSTIC EMISSIONS IN NEONATES AT TERM AND PRETERM AT MGMMC, JAMSHEDPUR

2020 ◽  
pp. 41-43
Author(s):  
Devendra Jee ◽  
Rohit Kumar Jha ◽  
Bhimsen Hansda ◽  
Debarshi Jana
Keyword(s):  
Hearing Loss ◽  
Frequency Spectrum ◽  
Auditory System ◽  
Gestational Age ◽  
Otoacoustic Emissions ◽  
Risk Indicators ◽  
Frequency Increase ◽  
Premature Babies ◽  
Neonatal Hearing Screening ◽  
Peripheral Auditory System

The transient evoked otoacoustic emissions (TEOAEs) have been widely used in neonatal hearing screening. OBJECTIVE: To compare the TEOAEs in newborns at term and preterm vis-à-vis the following variables: ear side, gender, frequency spectrum and gestational age. METHOD: By means of 66 newborns up to the 28th day of life (41 newborns at term and 25 premature babies), we recorded TEOAEs. All the individuals did not have risk indicators for hearing loss. RESULTS: There was a signal/noise ratio improvement with frequency increase. No differences were observed between genders and between the ears, but there were differences among the children born at term and preterm in the frequency bands at 3 kHz and 4 kHz. CONCLUSION: The TEOAEs test is important for assessing the peripheral auditory system of newborns at term and preterm, making it possible to have responses regardless of gender and gestational age.

scholarly journals Prevalence, Risk Factors and Intra-Hospital Outcomes Relating to Peri-Intraventricular Hemorrhage in Premature Newborns of Gestational Age Less than 34 Weeks

2021 ◽  
Vol 11 (07) ◽  
pp. 898-910
Author(s):  
Ana Frante de Holanda Pinto Vasconcelos ◽  
Kaliny da Silva Galvão ◽  
Rodrigo Daudt Tenório ◽  
Ana Clara Monteiro Laranjeira ◽  
Délia Maria de M. L. Herrmann ◽  
...  
Keyword(s):  
Risk Factors ◽  
Gestational Age ◽  
Intraventricular Hemorrhage ◽  
Hospital Outcomes ◽  
Premature Newborns

scholarly journals The Middle Latency Response: A Review of Findings in Various Central Nervous System Lesions

2018 ◽  
Vol 29 (09) ◽  
pp. 855-867 ◽  
Author(s):  
Frank Musiek ◽  
Stephanie Nagle
Keyword(s):  
Nervous System ◽  
Auditory System ◽  
Evoked Potential ◽  
Auditory Evoked Potential ◽  
Central Auditory System ◽  
Auditory Brain Stem Response ◽  
Potential Value ◽  
Middle Latency Response ◽  
Latency Response ◽  
Middle Latency

AbstractThe middle latency response (MLR) first came to light as an auditory evoked potential in 1958. Since then, it has aroused substantial interest and investigation by clinicians and researchers alike. In recent history, its use and popularity have dwindled in tandem with various other auditory evoked potentials in audiology. One area for which MLR research and application has been overlooked is its potential value in measuring the neural integrity of the auditory thalamocortical pathway. In a broader sense, the MLR, when combined with the auditory brain stem response, can provide information concerning the status of much of the central auditory system pathways. This review is intended to provide information concerning the MLR as a measure of central auditory function for the reader to consider.To review and synthesize the scientific literature regarding the potential value of the MLR in assessing the integrity of the central auditory system and to provide the reader an informed perspective on the value of the MLR in this regard. Information is also provided on the MLR generator sites and fundamental characteristics of this evoked potential essential to its clinical and or research application.A systematic review and synthesis of the literature focusing on the MLR and lesions of the central auditory system.Studies and individual cases were reviewed and analyzed that evidenced documented lesions of the central auditory nervous system.The authors searched and reviewed the literature (journal articles, book chapters, and books) pertaining to central auditory system lesion effects on the MLR.Although findings varied from study to study, overall, the MLR was reasonably sensitive and specific to neurological compromise of the central auditory system. This finding is consistent with the generator sites of this evoked potential.The MLR is a valuable tool for assessing the integrity of the central auditory system. It should be of interest to the clinician or researcher who focuses their attention on the function and dysfunction of the higher auditory system.

scholarly journals The auditory evoked potential in premature small for gestational age infants

2006 ◽  
Vol 49 (12) ◽  
pp. 1308
Author(s):  
Il Hong Moon ◽  
Kee Soo Ha ◽  
Gui Sang Kim ◽  
Byung Min Choi ◽  
Baik-Lin Eun ◽  
...  
Keyword(s):  
Gestational Age ◽  
Small For Gestational Age ◽  
Evoked Potential ◽  
Auditory Evoked Potential
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